646320531 has 8 divisors (see below), whose sum is σ = 878020560. Its totient is φ = 422750432.

The previous prime is 646320527. The next prime is 646320541. The reversal of 646320531 is 135023646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 646320531 - 2² = 646320527 is a prime.

It is a super-2 number, since 2×646320531² = 835460457584243922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (646320541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2032296 + ... + 2032613.

It is an arithmetic number, because the mean of its divisors is an integer number (109752570).

Almost surely, 2^646320531 is an apocalyptic number.

646320531 is a deficient number, since it is larger than the sum of its proper divisors (231700029).

646320531 is a wasteful number, since it uses less digits than its factorization.

646320531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4064965.

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 646320531 is about 25422.8348340621. The cubic root of 646320531 is about 864.6014986440.

The spelling of 646320531 in words is "six hundred forty-six million, three hundred twenty thousand, five hundred thirty-one".